package com.it.base.arithmetic.tree.redblackTree;

import java.util.ArrayList;
import java.util.TreeMap;
import java.util.TreeSet;

public class Test {
    public static void main(String[] args) {
        ArrayList arrayList = new ArrayList();
        arrayList.add(1);
        TreeMap treeMap = new TreeMap();
        treeMap.put("a","a");
        TreeSet treeSet = new TreeSet();
        treeSet.add("a");
    }
}
